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No model, neither test models nor real world model has really been used and tested using the 2.0 standard. Hence, there are many unknowns and in order to get around all possible issues, quite a lot of work is required.
Limited resources within OATC for testing and development, in order to get as well the standard as the SDK "correct".
Limited resources for GUI development and support.
Updates to the standard
Documentation, IValueSet:
IExchangeItem.ElementSet == null : spatially independent
IExchangeItem.ElementSet.ElementCount == 0 : spatially dependent but no values available yet.
IExchangeItem.TimeSet == null : Time independent.
IExchangeItem.TimeSet.Times == null : No meaning, not allowed.
IExchangeItem.TimeSet.Times.Count == 0 : Time dependent, but no values available yet.
Limited resources within OATC for testing and development, in order to get as well the standard as the SDK "correct".
Limited resources for GUI development and supportIValueSet.ElementCount and IValueSet.TimesCount is removed 
.